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Патент USA US3035214

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May 15, 1962
c. DILLON ET AL
3,035,204
DEVICE FOR HIGH VOLTAGE GAS-‘FILLED RECTIFIERS
Filed May 25, 1960
2 Sheets-Sheet 1
m
May 15, 1962
c. DILLON ET AL
3,035,204
DEVICE FOR HIGH VOLTAGE GAS-FILLED RECTIFIERS
Filed May 25,1960
2 Sheets-Sheet 2
v
V NTOR.
Char/Es ?IY/OIV
Gan/NH!‘ Ely/73771701
United States Patent 0
1C6
3,035,204
Patented ‘May 15, 1962
1
2
3,035,204
The invention will be further explained in the following
with reference to the accompanying drawings in which
by way of example, FIGURE 1 shows a diagram of the
connection for a device according to the invention, FIG
URES 2 and 3 show the constructive shape of the device
according to FIGURE 1, and FIGURE 4 the perform
DEVICE FOR HIGH VOLTAGE GAS-FILLED
RECTIFIERS
__
Charles Dillon, Cork, Ireland, and Gunnar Engstrom,
Ludvika, Sweden, assignors to Allmanna Svenska Elek
triska Aktiebolaget Vasteras, Sweden, a corporation of
Sweden
1,
-
Filed May 23, 1960, Ser. No. 31,005
Claims priority, application Sweden June 3, 1959
ance of a body for connection of the different components
in the voltage divider and the voltage dependent resistors.
FiGURE 1 shows a high voltage gas-?lled recti?er '1
_
3 Claims. (Cl. 315-36)
The present invention relates to a device for a high
with an anode 2, a cathode 3 and a number of interme
diate electrodes 4. The intermediate electrodes 4 are con
voltage gas-?lled recti?er provided with a number of
intermediate electrodes connected to a voltage divider
nected to a voltage divider inserted between the anode 2
It has been observed that in gas?lled recti?ers with
voltage dividers of this type ?ash-over may arise between
the connections between the intermediate electrodes and
the voltage divider and over the components of the volt 20
and the resistor chain 5 are parallel connected and at the
same time connected by a number of transverse connec
some cases via series resistors 8.
age divider. It is observed that one of the reasons for
this is that it takes a certain time for the arc during the
connections between the intermediate electrodes and the
voltage divider voltage dependent resistors 9 are inserted
ignition of a recti?er of said type to extend from the
cathode via the intermediate electrodes to the anode.
limiting the voltage between the intermediate electrodes
and the cathode 3. The voltage divider consists partly
consisting of resistors and capacitors, said voltage divider
of a purely resistive voltage divider consisting of resistors
being inserted between the anode and the cathode of the 15 5 and a combined capacitor-resistor chain consisting of
recti?er.
capacitors 6 and resistors 7. The capacitor-resistor chain
tions and connected to the intermediate electrodes 4, in
Between some of the
during the ignition so that no ?ash~over arises. Further,
During ignition a still greater part of the total voltage 25 spark gaps 10 are inserted between the connections be
difference between the anode and the cathode thus will be
tween the intermediate electrodes 4 and the voltage
concentrated in the part of the voltage divider nearest
divider, which spark gaps contribute to protecting the
to the anode so that in this part voltage concentrations
voltage dependent resistors 9 and the components of the
will arise between the connections between the interme
voltage divider at quenching of the are between some of
diate electrodes and the voltage divider. These great volt 30 the intermediate electrodes 4. In some cases voltage
age in?uences may cause ?ash-over between the connec
dependent resistors are connected not only between the
tions between the intermediate electrodes and the voltage
connections to the intermediate electrodes, but also, by
divider owing to the fact that ?ash-over occurs more
way of example, between the anode and the adjacent
rapidly in the air outside the recti?er than inside the
intermediate electrode, in which case, however, the volt
recti?er. Another reason for ?ash-over occurring is that 35 age dependent resistors of course must be dimensioned
during normal operation of the recti?er interruptions in
for a greater e?ect.
the arc could arise, so-called quenchings between some
of the intermediate electrodes. In this case the great
FIGURE 2 shows the constructive shaping of a part
of the device of FIGURE 1, more exactly, the part be
load current through the recti?er tends to pass through
tween the points A in FIGURE 1. FIGURE 3 shows the
that part of the voltage divider which is connected be 40 device of FIGURE 2 seen from above. The components
tween said intermediate electrodes. Consequently, owing
in FIGURES _2 and 3 are provided with the same ref
to the very great current, great over voltages will arise
erence ‘numbers as in FIGURE 1. 11 are the inlets
over this part of the voltage divider, which may give ?ash
through the external recti?er casing to the intermediate
over.
electrodes. 12 is an isolating supporting pillar. The
The risk and consequence of such flash-over are very 45 components are connected by means of bodies 13 which
much decreased by the present invention, which is sub
are so shaped that they serve as mechanical as well as
stantially characterised in that voltage dependent resistors
electrical connections between the components, and be
are inserted between at least some of the connections
sides this, form are gap electrodes for the arc gaps be
between the intermediate electrodes, and the voltage
tween the components and the connections respectively.
divider. Through these voltage dependent resistors, the 50
over voltages over the voltage divider are limited so that
no ?ash-over will arise. These voltage dependent resis
tors, however, could ‘not all alone protect the voltage
divider against over voltages arising at a quenching of
the arc during normal operation of the recti?er. This is, 55
however possible if according to the invention, spark gaps
These connection bodies are, when they serve as a con
nection point to any part of the capacitor 6, attached to
this by means of inlets 14 to the capacitor. The connec
tion bodies 13 ‘serving as connection points for the inter
mediate electrodes 4 in the recti?er, are either fastened
directly to the casing of the recti?er 1 by an inlet 11 or
to the casing by means of a pin insulator 15, in which
case, the connection between the connection bodies 13
are inserted over the voltage dependent resistors and pos
sibly even between such connections between the inter
and an inlet 11 is made by means of a separate conductor
mediate electrodes and the voltage divider where no volt
16. The other connection bodies 13 which only serve as
age dependent resistors are inserted. Certainly it is nor 60 a connection between di?erent components in the voltage
mally not possible to protect a voltage dependent resistor
divider are attached by means of an insulating support 12.
by means of a spark gap parallel connected to the resistor,
FIGURE 4 shows a form of the connection bodies 13
which are attached to the recti?er casing by means of pin
but in this case, however, it is possible owing to the very
great current tending to pass through the voltage depend
insulators 15. The connection body consists of two sub
ent resistor and the voltage divider at quenching of the 65 stantially spherical halves 17 and 18 of conducting mate
rial, which halves are kept together by means of a screw
arc. Further, according to the invention, the bodies for
19 and are attached to the pin insulator 15 by means of
connection of the voltage dependent resistors and the
a bolt 20. Both halves 17 and 18 are provided with
resistors and the capacitors of the voltage divider could
openings in which spring contact terminals 21 and 22 are
be suitably so shaped that they serve as mechanical as
arranged, which serve as supports as well as electrical
well as electrical connections of the components, and
connections ‘for the resistors 5. The connection body 13
besides this, as spark gap electrodes for the spark gaps
between the components.
-
serves as'mechanical as well as electrical connection for
the di?erent components in the device and serves besides
3,035,204
3
4%
this, owing to its form, as arc gap electrodes for the arc
least some of the connections between said intermediate
gaps between the components. If desired, both the halves
electrodes and said voltage divider.
3. An arrangement as set forth in claim 2, including
bodies for connection of said voltage dependent resistors
and said resistors ‘and capacitors of said voltage divider,
17 and 18 could as shown in FIGURES 2 and 3 be pro
vided with salient horns serving as are gap electrodes.
‘We claim:
’
_
said'bod'ies being shaped in order to serve as mechanical
as well as ‘electrical connections to the components, and
said anode unit being provided with a number of inter
besides this, as spark gap electrodes for said spark gaps
mediate electrodes, said intermediate electrodes connected
between the components.
to a voltage divider, said voltage divider consisting of
resistors and capacitors and being inserted between the 10'
References ‘fitted in the ?le of this patent
anode and the cathode of the recti?er, voltage dependent
resistors inserted between at least some of the connec
UNITED STATES PATENTS
tions between said intermediate electrodes and said volt
1. Anode unit for a high voltage gas-?lled recti?er;
age divider,
2. An arrangement as set forth in claim 1, including 15
ep'ark gaps; said spark gaps being inserted between at
2,145,727
Lloyd _______ _>_____-~___'__ Jan. 31, 1939
2,205,231
Steenback ____________ __. June 18, 1940
2,386,400
, Jonas ________________ __ Oct. 9, 1945
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